APAR status
Closed as program error.
Error description
Error Message: N/A . Stack Trace: N/A .
Local fix
-Xjit:disableAllocationSinking
Problem summary
An optimization called allocation sinking moves object allocations downward in the code. On PPC is can also sink the corresponding memory flush instruction. However, there was a subtle bug in the opt which could cause it to sink an unrelated flush. That means an unrelated allocation can have its flush delayed, opening up a small window where another thread could see the allocated object in an uninitialized state.
Problem conclusion
This defect will be fixed in: 7.0.0 SR2 6.0.1 SR3 . The opt was fixed so it only sinks the correct flush.
Temporary fix
Comments
APAR Information
APAR number
IV20173
Reported component name
JIT
Reported component ID
620700124
Reported release
260
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2012-04-24
Closed date
2012-05-04
Last modified date
2012-09-06
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
JIT
Fixed component ID
620700124
Applicable component levels
R260 PSY
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